:root {
  --bg: #090b10;
  --bg-soft: #11151f;
  --card: #121722;
  --border: #1f2634;
  --text: #edf1fa;
  --muted: #9aa4ba;
  --accent: #9ec0ff;
  --accent-strong: #bfd5ff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 600px at 20% -10%, #161d2c 0%, transparent 50%), var(--bg);
}

.app-shell {
  max-width: 700px;
  margin: 0 auto;
  padding: 3.5rem 1.1rem;
}

.app-header {
  margin-bottom: 1.2rem;
}

.eyebrow {
  margin: 0;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 700;
}

h1 {
  margin: 0.35rem 0 0;
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  letter-spacing: -0.02em;
}

.panel {
  background: linear-gradient(180deg, color-mix(in oklab, var(--card) 92%, black), var(--card));
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1rem;
  box-shadow: 0 16px 44px rgba(0, 0, 0, 0.34);
}

.controls {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

label {
  display: grid;
  gap: 0.35rem;
  color: var(--muted);
  font-size: 0.86rem;
}

select,
button {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--bg-soft) 88%, black);
  color: var(--text);
  padding: 0.7rem 0.8rem;
}

button {
  cursor: pointer;
  font-weight: 600;
}

.primary-btn {
  border-color: #2a3348;
  background: #1a2232;
  color: var(--accent-strong);
}

.primary-btn:hover {
  border-color: #3b4966;
  background: #202a3f;
}

.result {
  margin-top: 1rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  min-height: 170px;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 1rem;
  background: color-mix(in oklab, var(--bg-soft) 82%, black);
}

.chart-card {
  margin-top: 0.9rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0.6rem 0.8rem;
  background: color-mix(in oklab, var(--bg-soft) 86%, black);
}

#historyChart {
  width: 100%;
  height: 190px;
  display: block;
}

#chartHint {
  margin-top: 0.35rem;
}

.insight-card {
  margin-top: 0.9rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0.8rem 0.9rem;
  background: color-mix(in oklab, var(--bg-soft) 86%, black);
  line-height: 1.45;
}

.insight-card strong { color: var(--text); }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border: 1px solid #2b364d;
  color: var(--accent);
  border-radius: 999px;
  padding: 0.22rem 0.62rem;
  font-size: 0.76rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.price {
  margin: 0;
  font-size: clamp(2rem, 8vw, 3.4rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  font-weight: 800;
}

.muted { color: var(--muted); }
.small { font-size: 0.82rem; }

.actions {
  margin-top: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
}

.app-footer {
  text-align: center;
  margin-top: 0.9rem;
  opacity: 0.85;
}

@media (max-width: 640px) {
  .controls { grid-template-columns: 1fr; }
  .actions { flex-direction: column; align-items: stretch; }
}